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The former Met Assistant Commissioner, a career detective widely regarded as one of the country’s top chief constables, will also examine the statement given to police by civil servant mole Christopher Galley, who was arrested earlier last month.

Mr Galley insists the information he leaked ‘was in the public interest’.

Crucially, Mr Johnston will review whether it was right and ‘proportionate’ to arrest Mr Green and search his offices in Westminster.

Mr Johnston, who chairs the Association of Chief Police Officers crime committee, willdeliver his interim findings to Sir Paul within seven days, followed by a full report in twoweeks.

Sir Paul – who sanctioned the decision to arrest Mr Green – said he wanted Mr Johnston to look into his force’s ‘decisions, actions and handling of the investigation’.